Ranked in these QuestionsQuestion Ranking
Pro Supports Push in Gmail
Mail finally supports Push for Gmail accounts in iOS 11
Pro Comes pre-installed on all iOS devices
No need to go out and install another app from the App Store.
Pro Integrates with iOS search
You can use spotlight to search through emails.
Con Some emails on iPad have excess padding
iPad version adds padding to text that can't be overridden and it can mess up the layout of the email.